Valve mechanism



May s, 1928.

s. T. NELSON VALVE 'uncnmsm Original Filed Jan. 10, 1921 Patented May 8, 1928.

SVEN T. NELSON, .OF CHICAGO, ILLINOIS, ASSIGNOR '10 SULLIVAN MACHINERY, cox- ]?ANY, A. CORPORATION OF MASSACHUSETTS.

VALVE MECHANISM.

Application filed January 10, .1921, Serial No. 436,222. Renewed July 30, 1927.

My invention relates to valve mechanisms and more particularly to valve mechanism for pumps, especially of the type used for the compression of gaseous fluids.

An object of my invention is to provide an improved valve mechanism. A further object of my invention is to provide an improved valve mechanism for'gaseous fluid compressors which will be of simple form and in which machine work may be reduced to a minimum. Other objects of my invention will appear in the course of the followin specification and the appended claims.

or purposes of illustration I have shown in the accompanying drawings certain forms which my inventionmay assume in practice.

In these drawings,-

Fig. 1 is a central vertical section through one end of a compressor cylinder.

Fig. 2 is a plan view of a discharge valve constructed according to my improved pattern.

Fig. 3 is a side elevation of said valve.

Fig. 4 is a section taken on, the line 4 4 of Fig. 2.

Fig. 5 is a plan andFig. 6 an end view of one form of valve which may be used in my improved valvefineclianism.

Fig. 7 is a plan and Fig. 8a side elevation of a spring for use with the valve shown in Figures 5 and 6. I

Fig. 9 is a section on the line 99 of Fig. 2 taken transversely of my improved valve mechanism.

Fig. 1.0 and Fig. 11 are plan views-of two other formswhich my improvedspring may assume in practice.

In the accompanying drawings, I have shown my improved valve mechanism used with an air compressor of a well-known type. This air compressor comprises a cylinder 1 providedvvith a bore. 2in which a piston 3 isreciprocable in a well-known manner. Thecompressor head 4 is divided into two compartments 5 and 6 which are closed on the side adjacent the compressor cylinder .by. a supplemental head plate 7 and which are separated by a transverse partition 8. Disposed in the compartment 5 is my improved discharge valve mechanism generally indicated by 9 and in the compartment 6 is shown my improved inlet valve mechanism generally indicated by 10.

The discharge valve mechanism is of a construction which may best be understood by an nspection of Figs. 2, 3, 4, and 9. It gomprises a series of parallel port slots 1]. extending through the head 7 cable with the chamber 5. To permit the communication of these port slots with the chamber 5 at proper times and toprevent this communication at other times, I employ a fiat valve of relatively thin plane sheet metal whereby it tends to seat snugly, this valve being designated 12 and being best shown in Fig. 5. The valve is traversed by a series of ports 13, having between the same and communiport closing sections 14 adapted to overlie the port slots 11, it being understood that when the valve is seated, the port slots 11 are closed by the portions 14 and that when the valve is raised from its seat, the air discharged through the port slots 11 passes through the ports 13 and also past the edges of the valves as will be hereinafter described. The valve is maintained in position upon its seat, which alone needs to be carefully finished, by means of a cage 15, made in the form of a box, open at the top, which in Fig. 1 lies against the plate 7, and having the bottom thereof traversed by a series of ports 16, these ports being arranged in alinement with web members 17 forming aportion of the seat intermediate the port slots 11. The lateral edges of the box 15 are also cut away as shown at 18 ,(Fig. 2) and it will be obvious that when the valve 12 is raised above its seat. fluid is free to pass both through the passages 16 and the cut-away portions 18 at the sides of the box. Cooperating with the valve 12 and with the box 15 is a spring shown in Figs. 7 and 8 as of identical contour with the valve 12 prior to rolling, this spring which isdesignated 19, however, being rolled so as to give it apermanentflexure about an axis parallel to the transverse median line of the spring and having slightly flattened or upturned ends 20 to minimize cutting action between the spring and valve. The valve box or cage 15 is provided with an integral extension 21 which is adapted to be bolted by short screws 22 to the intermediate head member 7 of the cylinder.

The construction of the intake valves is in general similar to that of the discharge valves, but by reason of the fact that it is necessary to prevent admission of air to the. cylinder by way of the ports 11, other than at such times as the valves 12" are unseated, the cage 15 is not cut away in the same manner as the cage 15 at its side edges, making instead a tight joint with the head member 7, and the seat for the valve 12 is formed upon the cage member 15 instead ofupon tne intermediate head member 7.

It will be obvious that I do not necessarily employ springs of thetype disclosed in Figs. 7 and 8, but that these springs may assume other forms and in Figs. 10 and 11 I have showntwo different types of springs whichmay be employed, that in Fig. 100 being of a squared figure-8 shape and that in Fig. 11 being of an H-shape. I

While I have in this'application specifically described several forms which my invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention maybe modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

hat I claim as new and desire to secure by Letters Patent is:

1. In a pump having a cylinder, a piston reciprocable therein and a cylinder head. valve mechanism comprising a plurality of specially separated port slots formed in said head, a box having a recess formed in one side thereof and disposed over said port slots in such manner that said slots communi cate with said recess, a plurality of port slots traversing a wall of said recess, a valve seat formed on said head surrounding the outer ends of each of the slots formed in the head, and a single valve cooperating with said seat to open and close the port therein and disposed in said recess.

2. In a pump having a cylinder, a piston reciprocable therein and'a cylinder head, valvemechanism comprisinga plurality of parallel port slots formed in said head, a valve seating surface on said head surrounding said slots, a valve cooperating with said seating surface and comprising a plurality of port closure elements connected only at their ends, and a ported cover member for said valve contacting with said seat at the ends thereof but spaced therefrom at all points adjacent the transverse median line of said valve whereby flow of fluid from beneath said cover member in directions parallel to the valve seating surface is permitted, said valve being guided by said cover member during movement towards and from seated position by contact with said cover member at points at the ends of the remote sides of the two furthest spaced port closure elements.

3. In a pump having a cylinder, a piston reciprocable therein and a cylinder head,

valve mechanism comprising a port slot formed in said head, a valve seat surrounding said slot, a Valve cooperating with said seat and movable bodily towards and from the same; a cover for said valve comprising a box recessed adjacent said seat to re ceive said valve and ported in the side opposite said seat and in lateral sides thereof also,-and means for holding said cover upon said head cooperating with said cover only at one end thereof.

4. In a ump having a cylinder, a piston reciprocal) e therein and a cylinder head, valve mechanism comprising a port slot formed directly in said head and communicating directly with the cylinder bore, a box secured to said head and having a recess facing said head, said recess communicating with the exterior of said box by a port slot out of alinement with but parallel to said port slot in the head, a valve seat formed on said head surrounding the port slot in the head at the end thereof opening into said recess, a valve disposed inv said recess and cooperating with said seat, and a ported spring cooperating with said valve to maintain the same normally seated;

5. In a pump having a'cylinder, a piston reciprocable therein and a cylinder head, valve mechanism comprising a "lurality of port slots formed directly in said head andcommunicating directly with the cylinder bore, a valve seat formed on the outer surface of said head so as to surround said port slots, a box secured to said head and'recessed in its side adjacent said slots to provide communication with the exterior of said box by at least one port slot out of alinement with but parallel tosaid port slots in the head, a ported valve disposedin said recess andcooperating with said seat, and a ported spring cooperating with said valve to maintain the same normally seated.

6. In afpump havin a'cylinder, a piston reciprocable in said 0y inder, and a cylinder head, valve mechanism comprising a port slot formed in said. head and surrounded by a plane surface of greater area than the area of the valve which cooperates therewith, a valve cooperating with said surface on said head and comprising a single relatively thin, plane, elongated metal plate, and a guard overlying said valve cooperating with the ends of the latter to guide the same during opening and closing and comprising a box secured to said head and open along the lateral edges of the valve to permit passage of air laterally from said box in directions parallel to the valve seat surface, said guard permitting similar movements of each end of said valve.

7 In a pump havinga cylinder, a piston recip'rocab e in said cylinder, and a cylinder head member, a cooperating member secured to said cylinder head-member and cooperating withthe head member to form a chamber of which the head member provides one Wall, said cooperating member and head member having parallel port means therein arranged out of alinement with each other,

a valve seat surrounding the port means in one of saidmemberstzmd a valve loose in said chamber comprising a thin plane flexible metal strip-cooperating with said valve seat, said cooperating member having its 10 SVEN T. NELSON. 

